I've had a Flame Angel for three years and it's never picked at corals or zoas. It is more like a Mandarin in that it hunts copepods all day long. It never stops moving and covers the whole tank. It is certainly a loner and doesn't interact with any of the other fish. I've seen it chasing the dominant Blue-Green Chromis a few times, which is twice as large as it is. It sure is a tough little fish. When I first put it in the Powder Blue didn't like it, but it couldn't catch it either. I'm so glad that all my fish get along great.